Just swapped my computer to a new case and now the computer won't turn on

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Melt Man

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Dec 30, 2016
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1,510
I just finished swapping all of my parts to a new case, it's a cooler master one, and now
I'm having a problem with my computer turning on. Whenever I have the system fan 4 pin connector in the computer won't start at all, and if I have it unplugged, the fans move slightly as if they are about the start up, and the LEDs on the fans come on for about a half of a second. Also the LEDs on the front of my computer where the USB ports are stay on until I turn the computer on. Pressing the power button again doesn't turn off my computer or the LEDs that stay lit up.I have tried reseating the ram, unplugging the PSU from the MOBO and reconnecting it, and unconnecting the PSU from my graphics card but I am still getting the same result.

I also put in the standoffs, and I only put in the correct amount so I know there isn't any extras under the motherboard.

My computer specs are

MOBO: GA-990FXA-UD3
Case: HAF 932 Cooler Master
PSU: Corsair CX750M 750w
GFX: Geforce GTX 460

Any help or clue as to why it might be doing this would be greatly appreciated!
 
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M

Melt Man

Commendable
Dec 30, 2016
9
0
1,510


I unplugged everything and made sure there wasn't any loose screws or anything under the motherboard, I did find a screw inside of my graphics card and I'm really not sure how that got there but I removed it- but I'm still having the same problem. should I have the sys_fan 4 pin plugged in? Whenever it's plugged in nothing comes on, not even the LEDs but when it's not in I just get the computer almost starting but not problem.
 
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M

Melt Man

Commendable
Dec 30, 2016
9
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1,510


I tried it again in my old case, and I also tried it while breadboxing and still just got the slight jiggle of the Processor fan and that was it. I'm thinking it's possible that it could be my motherboard, processor, or PSU, but I'm really not sure how I can test my motherboard or processor, and I don't have another PSU to test that out either.

I just replaced all three of those parts last year around the same time too, so it's possible that one or multiple got ESD while being transferred?
 
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1LiquidPC

1LiquidPC

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Oct 11, 2014
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It's possibly, but that's an unlikely scenario regarding ESD. I'd suspect physical damage of some sort before I'd fall back to it. You could try the "paperclip" test on your PSU. A quick google search will explain in detail w/ pictures provided. Since you're getting a "tick" of sorts with fan movement, I'd suspect a board or PSU issue. A system would still power up even without a CPU installed, or a defective one, and just not POST.
 
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M

Melt Man

Commendable
Dec 30, 2016
9
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1,510


So I finally got around to getting a paperclip and testing my PSU and I can confirm that it works fine (as far as the paperclip test says anyway). So is it possible that the motherboard could be scratched or anything? It seems odd that the processor fan can get a slight jiggle even if the motherboard were to be damaged, but I would like to make 100% sure that it's the mobo before I send it back.
 
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1LiquidPC

1LiquidPC

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Oct 11, 2014
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If PSU test with paperclip is repeatable, but plugged into board it doesn't power up, I'd say the board could be damaged. Possible that odd screw shorted something out at some point. You could try removing CPU, RAM,GPU, all power cables one more time and reinstall to test. However, without other tester parts hard to be certain. Could still be the PSU though. Paperclip is generally just to see if PSU is completely dead or not.
 
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M

Melt Man

Commendable
Dec 30, 2016
9
0
1,510


oh okay, I see. They were both purchased last year, but it seems more likely to me that the board may have been scratched or damaged in some way when I was swapping cases. It seems like the mobo is the most likely scenario to me, so I'll return that and see what happens when the new one comes in. Thanks so much for the help I really appreciate it.
 
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M

Melt Man

Commendable
Dec 30, 2016
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1,510


Updated, new motherboard came in and I hooked up everything correctly and I'm receiving the same problem. now that I know it's not the motherboard, does this seem like it would be a problem with the processor?
 
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salerhino

salerhino

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Mar 16, 2016
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Go to the nearest computer service shop, they will help you for some small price probably but it will save you from headache hah. Just bring CPU with you
 
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1LiquidPC

1LiquidPC

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Oct 11, 2014
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Was the CPU removed at all during the initial swap? If not, I'd say its unlikely the CPU. By replacing the board and still same problem, I'd suspect a PSU. Outside of a short, no powerup at all is a motherboard or PSU issue. Even without a CPU, RAM, GPU, or drives installed, the system should still power on and just beep and not POST. I just went through the paperclip test myself a couple months ago. PSU worked fine with nothing plugged in(4 out of 5 boots or so). However, plugged into board was off/on strange power cycle or no powerup at all.
 
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M

Melt Man

Commendable
Dec 30, 2016
9
0
1,510
Okay so I finally got it working after bringing it to my mom's companies IT people. One of the power supply cords that was plugged into a fan didn't need to be and that was the entire reason it didn't start up. I guess I should have double checked all of my cables better haha
 
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salerhino

salerhino

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Mar 16, 2016
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I am glad that it wasn't a huge problem. :)
 
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